In production, the length of the drill bit is often used to solve the hole with a depth greater than the length of the drill bit or a hole that is not accessible to the deep drill bit. The key to the length of the drill bit is the way the drill bit is connected to the post. It not only ensures the coaxiality of the rod to the drill bit, but also connects reliably and transmits the cutting torque. To this end, we use the three lengths of the drill bit as shown in the figure, after many years of use, the effect is very good.
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